Author Question: Two economically important metamorphic minerals are graphite and corundum, which can be used, ... (Read 56 times)

EY67 · **on:** Jul 13, 2018

Two economically important metamorphic minerals are graphite and corundum, which can be used, respectively, for ____.
A)abrasives and furnace linings
B)furnace linings and abrasives
C)furnace linings and dry lubricants
D)dry lubricants and abrasives
E)dry lubricants and talcum powder

Question 2

Explain why increased seafloor spreading, resulting in higher heat flow and an increase and rapid expansion in oceanic ridges during the Cretaceous, result in worldwide transgression onto the continents.

mmpiza · **Reply #1 on:** Jul 13, 2018

Answer to Question 1

D

Answer to Question 2

Increased seafloor spreading and higher heat flow would result in a higher amount of new oceanic crust coming from spreading ridges. New, hot oceanic crust is less dense than cooled oceanic crust. This less-dense crust would displace more ocean water onto the continents.